Continuous method of forming flat-folded lined cartons



' H. F. WATERS Dec. 2, 1947.

CONTINUOUS METHOD oF FORMING FLAT-FOLDED LINED cARToNs 2 Sheets-SheeflFiled Dec. 18, 1941 f INVENTOR Har/yfWa/e/J BY 1L/LM BNS JA www H. F.WATERS Dec. 2, 1947.

CONTINUOUS METHOD OF FORMING FLAT-FOLDED LI'NED CRTONS Filed Deo. 18,1941 2 Sheets-Sheet 2 INVENTOR mw m WFM

Mim BEK I l l l l I I l l l l l l I I I l l lla www drfy F Wer/ers hun@L 71mm Patented Dec. Z, 1947 CONTINUOUS METHOD OF FORMING FLAT-FOLDEDLINEE CARTONS Harry F. Waters, New York, N. Y.

Application December 18, 1941, Serial No. 423,425

1 Claim.

The present invention relates to containers, and, more particularly, toan improved method of making containers in a continuous process.

Heretofore, various paper containers for` holding liquids, and,particularly, fluent solids, have been proposed. Usually, thesecontainers comprised external containers of paper, cardboard, or othersheetlike material, having appreciable strength, and an inner receptacleor container of flexible character and substantially impermeable toliquids and gases. The inner recep'acle or container is characterized bya fluid-proof facing or sheeting mounted on or secured to a paperbacking. Various plastic materials, and particularly thermoplastic, suchas rubber hydrochloride, cellulose ethers and esters, and othercompounds Were used. These materials, when juxtaposed, were capable ofbeing united and interfused by the application of heat and pressure.

In the preparation of such lined containers, it has been the usualpractice to prefabricate the carton blanks in desired shapes andmanually apply the desired lining materials, after which the fabricatingor package erecting steps were carried out. Such manual operations wereessentially slow and rendered the resulting products costly to a pointwhere they could not compete with other materials currently fabricatedby automatic machinery.

It is a feature of novelty of the present invention to provide acompletely auto-matic method for fabricating lined containerscontinuously from strip materials. A further feature of novelty is thecontinuous fabrication of lined containers from strip material havingpackage defining sections formed in the strip and the package, includingthe liner, substantially made up in nat condition before severing orotherwise removing from the continuous web or strip.

These and other desirable features and advantages of the presentinvention will be described in the specification and illustrated in theaccompanying drawings, certain preferred productsv being delineated byway of illustration only, for, since the underlying principles may beembodied in other specific structures, it is not intended to be limitedto the ones here shown, except where such limitations are clearlyimposed by the appended claim.

In the drawings, like numerals refer to similar parts throughout theseveral views, of which:

Figs. 1, 1A, 1B, lC are an elevation of the continuous steps in thefabrication of a container, and

Fig. 2 is a front perspective, showing the pack- 2 age and liner inerected position ready for -filling and sealing.

Referring more particularly to the draw-ings, the various stages of theprocess, as shown in Figs. 1, 1A, 1B, 1C, are designated by printedlegends, and the specic details of the procedure will now be described.

A roll of box board, or the like, designated by the numeral l0,is'maintained in the feed end of a machine, not shown, and on theunderside of the sheet, as indicated at I-l, printing may be applied. Asuitable printing device may be incorporated in the machine assembly,but, as specinc details of the machine parts fcrm no part of the presentinvention, they are not shown, but are indicated schematically by thelegends.

From the printing stage, the continuous web of board. Hl, proceedsthrough a cutting and scoring stage, l2, wherein Vthe web is blanked -oland scored to give a bank 20, having central longitudinal score lines2l, 22, 23 and edge score lines 24', 25 and 26. End score lines 3G, 3l,32 and 33, complete the scoring feature. In addition to scoring the webas indicated, cutouts lill, and '4l and slots 42, 43, fill, 45, 46 andil complete the operation at this station. To perform these cutting andscoring operations, suitable apparatus, adapted to reciprocate back andforth and travel with the advancing web, and return to engage and workon a new section of the web, may be used. This type of construction isknown as a dying-shears, and will not be described in detail, as theparticular construction forms no part of the present invention.

The blank 20 will be seen to comprise a pair of panel sections 59, 5l,and a central section 52 having longitudinal scoring 2| adapted to forma side wall of the nished package. In addition, there is an edge section53, having a central longitudinal score line, 24, and adapted to formthe opposite wall of the finished package, as well as an edge tab 51!adapted to be secured to section 53 to form the body section of thecomplete box. 'The end sections include, at the one end, tabs 6! and(il, separated by slots 55, 46 and 4l from central tabs 62, 53 held tothe complete web by the material between the slots. The other endsections comprise corresponding end panels E5, separated by score linesfrom the edge wall tabs 61, and E8. v

The cutting and scoring lines and sections noted provide a continuousseries of package or box blanks joined together in a continuous strip,and adapted to be severed or torn apart at the appipriate time.

After the web or strip of box board has been printed and blanked outinto a continuous strip of cut and scored box blanks, joined together,the panel sections of the box-to-be are coated or spotted withdiscontinuous lines of adhesive, indicated generally at '|0 and Thelongitudinal and transverse marginal segments of each of the side wallsections includes a separate strip or portion of adhesive. It is to benoted that these bands or spots of adhesive do not come to the cornersof the panels, leaving the latter free, as indicated generally at 12.When the adhesive is applied in the manner indicated, a second web ofthermoplastic-faced paper, 80, is superposed on and over the continuousweb of package blanks, and adhered thereto by suitable pressure, as bymeans of pressing rolls, not shown. The thermoplastic-faced paper may bea laminated product comprising a surface of liquid and gas-proof materials such as rubber hydrochloride, cellulose ethers and esters,maintained on, or supported by, a paper backing, with or without aninterposed thermoplastic adhesive, and which adhesive may or may notinclude suitable plasticizing agents. The exposed thermoplastic facewill form the interior surface of the lined carton, as will be moreapparent hereinafter. The specific structure and compositions of thethermoplastic-faced paper as disclosed is more vfully set forth andclaimed in my applications Serial Numbers 239,253, led April 12, 1940;331,907, led April 27, 1940; and 340,277, filed June 13, 1940. Forcertain uses, a plain thermoplastic liner may be used.

After the separate webs have been thus consolidated, and in order tofacilitate the formation of a package with the liner, erected intoshape, the composite web is cut, as indicated at 8|, to provide a slotor cut in the thermoplastic sheet 80 conforming to the slot or cut 40 inthe subjoined boxboard blank. From this cutting station the compositeweb proceeds to a folding station. Here, the blank section 50, with itssuperposed coating sheet 80, is folded over on central score line 2|, sothat the marginal edges 82 and 83 of the thermoplastic sheet aresuperposed in registration with each other over section 53 of the blank.It is to be noted that the marginal sections 82 and 83 of thethermoplastic sheet do not quite extend to the edge of the box blankunderneath the same. With the panel 50 folded over on fold line 2| intoengagement with panel the edges of the thermoplastic paper areheat-sealed as indicated at 84 and 85 in an L-shaped seal to form a flatbag lining. This sealing may be accomplished by the use of my thermalsealing machines disclosed in Patents 2,262,480, of November 11, 1941;2,125,758 of August 2, 1938; 2,220,873, of November 5, 1940; and2,252,105, of August 12, 1941,

With the liner edges thus interfused to form a bag section within thefolded over boxboard carcass, the web is next advanced, or continues itsadvance, to the next station, where a line of adhesive 90 is applied onthe edge or surface of tab 54. The composite continuous web thenadvances to the folding station where edge section or tab 53 is foldedup along score line 24 and over and onto the tab 54, the coating ofadhesive, 90, joining the tabs together in a perfect joint. It will benoted that the edge section 53 folds over the edge seal 84 of thethermoplastic paper and pinches or crimps same down in place withoutcausing it to be contacted by the adhesive 90. The complete flat box orcontainer, now designated, for convenience, by the numeral |00, willnext pass through a pressing station where the adhesive joined seams arepressed down to a smooth finish. The blanks then continue to the cuttingolf station where the at packages |00 are cut olf or severed along theline formed between slots and 4|.

The packages, in this fiat-folded condition, are adapted to be shippedflat, with an enormous sav ing of space, and when they are to be used,they can be pinched at the edges along lines 2|, and 24 to beimmediately erected into the package shown in Fig. 2. In this package,the sealed end seal section 80 is folded in any suitable manner onitself and the tabs 65, 66 and 61, 68 are sealed together to close thebottom leaving an open mouthed package having an erected inner liner B0adhered thereto at marginal sections but free of adherence, or floatingin the several corners of the finished package.

It will now be appreciated that a novel method of continuously formingliquid-proof, lined packages directly and continuously in folded, flatform, in a single continuous folded over web of laminated material hasbeen disclosed. This is susceptible of adaptation and use in continuousprinting, cutting and scoring mechanisms so as to permit a continuous orintermittent throughput, as desired, and avoiding the necessity ofcarrying out several operative steps by hand.

What is claimed is:

The method of forming fiat-folded paperboard packages having envelopeliners formed integrally therewith and erectible into squared up useposition, comprising die-cutting an advancing web of paper-board;adhering a supere 40 posed sheet of thermoplastic onto and over theadvancing web, thereby conforming the thermoplastic lining to the websections; folding the composite sheet to place the thermoplastic linerin juxtaposition and with the edges thereof in registration;heat-sealing the registering longitudinal edges of the thermoplasticliner and the trailing ends of the same to form an L-shaped seam forminga flat envelope; folding and adhering the edge of the paper-board overand on itself to form a flattened tube enclosing the envelope, andsevering the tube and envelope from the continuous web.

HARRY F. WATERS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,013,086 Baker Sept. 3, 19352,256,506 Wagoner Sept. 23, 1941 2,284,604 Brooks May 26, 1942 695,273Blrnie et al Mar. 11, 1902 1,907,067 Hartmann May 2, 1933 1,947,664Staude Feb. 20, 1934 2,114,621 Bergstein Apr. 19, 1938 695,369 Birnie etal Mar. 11, 1902 FOREIGN PATENTS Number Country Date 131,114 SwitzerlandMar. 11, 1902

